# DALC vs Trimble® FabShop Mobile Pro

The clearest difference is update cadence: DALC at every 2 weeks against Trimble® FabShop Mobile Pro's every 3 months. DALC also leads on review sentiment (15% vs 0%) and iOS requirement (6.0 vs 11.0). On price, ads, in-app purchases and monetization model there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

DALC ships an update every 2 weeks, Trimble® FabShop Mobile Pro every 3 months. The most recent releases landed on October 20, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | DALC | Trimble® FabShop Mobile Pro |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[2.1 (27 ratings)](https://appshunter.io/ios/app/dalc/id427624076/reviews)** | — |
| Number of ratings | **27** | — |
| Positive reviews | **14.8% of reviews** | 0.0% of reviews |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | **Every 2 weeks** | Every 3 months |
| Monetization | Free | Free |
| Size | 10 MB | 59 MB |
| Requires iOS | **6.0** | 11.0 |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [SHEET METAL CONTRACTORS NATIONAL ASSOCIATION, INC.](https://appshunter.io/developer/427624079) | [Trimble Inc.](https://appshunter.io/developer/322561665) |

## What reviewers say

### DALC

[App page](https://appshunter.io/ios/app/dalc/id427624076)

This tool helps engineers, architects, designers, and contractors accurately estimate air leakage from ductwork. It simplifies determining pass/fail for duct air leakage tests and allows combining multiple duct sections for total leakage calculations, adhering to industry standards.

**Highlights:** Estimate ductwork air leakage, Determine DALT pass/fail, Combine multiple duct sections, Calculate total allowable leakage, Provides suggested leakage classes, Compliant with industry standards

**Features:** macOS Compatibility

**In-app purchases:** none


### Trimble® FabShop Mobile Pro

[App page](https://appshunter.io/ios/app/trimble-fabshop-mobile-pro/id1244844695)

This app brings powerful HVAC duct fitting design capabilities to your tablet. Accurately enter fitting dimensions and preview them in 3D on-site, minimizing errors and rework. Streamline the transfer of field requests to your shop for increased project profitability.

**Highlights:** Comprehensive HVAC duct fitting library, 3D rotational preview of fittings, Field verification of fittings, Faster transfer of field requests, Reduced fitting waste and rework, Support for multiple shop configurations

**In-app purchases:** none


## Frequently asked questions

### Is DALC free?

DALC is free to download, with no in-app purchases.

### Is Trimble® FabShop Mobile Pro free?

Trimble® FabShop Mobile Pro is free to download, with no in-app purchases.

### Do DALC or Trimble® FabShop Mobile Pro have ads?

Neither DALC nor Trimble® FabShop Mobile Pro shows ads.

### Which is updated more often, DALC or Trimble® FabShop Mobile Pro?

DALC ships an update every 2 weeks, and Trimble® FabShop Mobile Pro every 3 months. Most recently, DALC was updated on October 20, 2026 and Trimble® FabShop Mobile Pro on October 21, 2026.

---

*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*